JP2917198B2 - Device for detecting combustion state of internal combustion engine - Google Patents
Device for detecting combustion state of internal combustion engineInfo
- Publication number
- JP2917198B2 JP2917198B2 JP30819893A JP30819893A JP2917198B2 JP 2917198 B2 JP2917198 B2 JP 2917198B2 JP 30819893 A JP30819893 A JP 30819893A JP 30819893 A JP30819893 A JP 30819893A JP 2917198 B2 JP2917198 B2 JP 2917198B2
- Authority
- JP
- Japan
- Prior art keywords
- cylinder pressure
- crank angle
- weighting
- combustion
- value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
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- Testing Of Engines (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は内燃機関の燃焼状態検出
装置に関し、詳しくは、筒内圧の積分値に基づいて燃焼
状態を検出する装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting a combustion state of an internal combustion engine, and more particularly to an apparatus for detecting a combustion state based on an integral value of an in-cylinder pressure.
【０００２】[0002]
【従来の技術】従来から、内燃機関の筒内圧を検出し、
該筒内圧の所定積分区間内における積分値に基づいて、
失火発生の有無を検出することが行なわれている（実開
昭６４−１５９３７号公報等参照）。上記のように筒内
圧の積分値を用いることで、筒内圧の瞬時値を用いて失
火発生を検出させる場合に比べ、圧力検出信号にノイズ
が重畳したときでも精度の良い失火検出が可能となる。2. Description of the Related Art Conventionally, the in-cylinder pressure of an internal combustion engine has been detected,
Based on the integral value of the in-cylinder pressure within a predetermined integral section,
Detection of the occurrence of misfire has been performed (see Japanese Utility Model Laid-Open No. 64-15937). By using the integrated value of the in-cylinder pressure as described above, accurate misfire detection can be performed even when noise is superimposed on the pressure detection signal, as compared to the case where misfire is detected using the instantaneous value of the in-cylinder pressure. .
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、筒内圧
の積分値に基づいて燃焼状態を検出させる構成であって
も、燃焼による圧力発生の絶対値が小さい低回転低負荷
域では、失火時の積分値と正常燃焼時における積分値と
に大きな偏差が生じなくなるため、精度の良い失火検出
が困難であるという問題があった。However, even if the combustion state is detected on the basis of the integrated value of the in-cylinder pressure, the integral at the time of misfiring in a low-speed low-load region where the absolute value of pressure generation due to combustion is small. Since there is no large deviation between the value and the integral value during normal combustion, there is a problem that it is difficult to detect misfire with high accuracy.
【０００４】本発明は上記問題点に鑑みなされたもので
あり、燃焼による発生圧力が小さい低回転低負荷域にお
いても、失火時と正常燃焼時とで筒内圧の積分値に明確
な偏差が生じるようにして、低回転低負荷域における失
火検出精度を向上させることを目的とする。The present invention has been made in view of the above-mentioned problems, and a clear deviation occurs in the integrated value of the in-cylinder pressure between misfire and normal combustion even in a low-speed low-load region where the pressure generated by combustion is small. Thus, an object of the present invention is to improve the misfire detection accuracy in a low rotation and low load range.
【０００５】[0005]
【課題を解決するための手段】そのため本発明にかかる
内燃機関の燃焼状態検出装置は、図１に示すように構成
される。図１において、筒内圧検出手段は、内燃機関の
筒内圧を検出し、筒内圧積分手段は、所定のクランク角
範囲を区分してなる複数の積分区間毎に、前記筒内圧検
出手段で検出される筒内圧を積分する。Therefore, a combustion state detecting apparatus for an internal combustion engine according to the present invention is configured as shown in FIG. In FIG. 1, the in-cylinder pressure detecting means detects the in-cylinder pressure of the internal combustion engine, and the in-cylinder pressure integrating means detects the in-cylinder pressure detecting means for each of a plurality of integral sections dividing a predetermined crank angle range. The cylinder pressure.
【０００６】また、重み付け設定手段は、前記複数の積
分区間毎に筒内圧積分値の重み付けを設定する手段であ
って、燃焼の後半ほど重み付けを大きく設定する。そし
て、積分値重み付け手段は、前記筒内圧積分手段で前記
複数の積分区間毎に得られた筒内圧積分値を、前記重み
付け設定手段で設定された各積分区間毎の重み付けによ
ってそれぞれに重み付けを行なって合計し、前記所定の
クランク角範囲における筒内圧の積分値を求める。The weight setting means is means for setting the weight of the in-cylinder pressure integrated value for each of the plurality of integration sections.
Therefore, the weight is set to be larger in the latter half of the combustion . The integral value weighting means weights each of the in-cylinder pressure integrated values obtained for each of the plurality of integration sections by the in-cylinder pressure integrating means by weighting for each of the integration sections set by the weight setting means. To obtain an integral value of the in-cylinder pressure in the predetermined crank angle range.
【０００７】ここで、燃焼状態検出手段は、積分値重み
付け手段で得られた前記所定のクランク角範囲における
筒内圧の積分値に基づいて機関の燃焼状態を検出する。Here, the combustion state detecting means detects the combustion state of the engine based on the integral value of the in-cylinder pressure in the predetermined crank angle range obtained by the integral value weighting means.
【０００８】[0008]
【作用】かかる構成によると、所定のクランク角範囲が
複数の積分区間に区分され、該複数の積分区間毎に筒内
圧が積分される。そして、前記所定のクランク角範囲に
おける筒内圧積分値を求めるに当たって、各積分区間毎
に重み付けを行なって積分値を合計する。With this configuration, the predetermined crank angle range is divided into a plurality of integral sections, and the in-cylinder pressure is integrated for each of the plurality of integral sections. Then, when obtaining the in-cylinder pressure integrated value in the predetermined crank angle range, weighting is performed for each integration section and the integrated values are summed.
【０００９】即ち、燃焼状態の変化（失火の有無）が筒
内圧積分値の変化として大きく表れる積分区間における
積分結果が、最終的に合計したときの値に大きく影響す
るようにすることで、各積分区間における積分結果の合
計値が、燃焼状態の変化によって明確な値の変化を示す
ようにするものであり、燃焼による圧力発生の絶対値が
小さくなる低回転低負荷域では長期に渡って後燃えし、
失火の有無による筒内圧の変化が、最大燃焼圧を示すク
ランク角位置よりも後でより明確になるため、燃焼の後
半ほど重み付けを大きく設定するようにした。 That is, the integration result in the integration section in which the change in the combustion state (presence or absence of misfire) greatly appears as the change in the in-cylinder pressure integrated value greatly affects the final total value. the total value of the integration result in the integration interval state, and are not to exhibit a change in definite value by a change in the combustion state, the absolute value of the pressure caused by the combustion
In the low-rotation low-load range where it becomes smaller, it burns after a long period of time,
The change in in-cylinder pressure due to the presence or absence of a misfire indicates the maximum combustion pressure.
After burning, because it becomes more clear later than the rank angle position
The weight is set to be larger halfway.
【００１０】[0010]
【実施例】以下に本発明の実施例を説明する。一実施例
を示す図２において、内燃機関１には、エアクリーナ
２，スロットルチャンバ３，吸気マニホールド４を介し
て空気が吸入される。そして、機関１からの燃焼排気
は、排気マニホールド５，排気ダクト６，三元触媒７，
マフラー８を介して大気中に排出される。Embodiments of the present invention will be described below. In FIG. 2 showing one embodiment, air is sucked into an internal combustion engine 1 through an air cleaner 2, a throttle chamber 3, and an intake manifold 4. The combustion exhaust from the engine 1 is supplied to an exhaust manifold 5, an exhaust duct 6, a three-way catalyst 7,
It is discharged to the atmosphere via the muffler 8.
【００１１】前記スロットルチャンバ３には、図示しな
いアクセルペダルに連動して開閉するスロットル弁９が
設けられており、このスロットル弁９によって機関１の
吸入空気量が調整されるようになっている。また、各気
筒（＃１〜＃４）の燃焼室に臨ませてそれぞれ点火栓
（図示省略）が装着されているが、かかる点火栓と対
に、それぞれの気筒毎に筒内圧検出手段としての筒内圧
センサ10ａ〜10ｄを設けてある。The throttle chamber 3 is provided with a throttle valve 9 which opens and closes in conjunction with an accelerator pedal (not shown). The throttle valve 9 adjusts the intake air amount of the engine 1. In addition, ignition plugs (not shown) are attached to the combustion chambers of the cylinders (# 1 to # 4), respectively. The ignition plugs are paired with the ignition plugs and serve as in-cylinder pressure detection means for each cylinder. In-cylinder pressure sensors 10a to 10d are provided.
【００１２】前記筒内圧センサ10ａ〜10ｄは、実開昭６
３−１７４３２号公報に開示されるような点火栓の座金
として装着されるタイプの他、特開平４−８１５５７号
公報に開示されるようなセンサ部を直接燃焼室内に臨ま
せて筒内圧を絶対圧として検出するタイプのものであっ
ても良い。また、機関１の図示しないカム軸には、カム
軸の回転を介してクランク角を検出するクランク角セン
サ11が設けられている。The in-cylinder pressure sensors 10a to 10d are
In addition to the type mounted as a washer for an ignition plug as disclosed in Japanese Patent Application Laid-Open No. 3-17432, the sensor section as disclosed in Japanese Patent Application Laid-Open No. 4-81557 is directly exposed to the combustion chamber to make the in-cylinder pressure absolute. It may be of a type that detects pressure. The camshaft (not shown) of the engine 1 is provided with a crank angle sensor 11 for detecting a crank angle through rotation of the camshaft.
【００１３】このクランク角センサ11は、本実施例の４
気筒機関１において、気筒間の行程位相差に相当するク
ランク角180 °毎の基準角度信号ＲＥＦと、単位クラン
ク角毎の単位角度信号ＰＯＳとをそれぞれ出力するセン
サである。尚、前記基準角度信号ＲＥＦは、気筒判別が
行なえるように、少なくとも特定１気筒に対応する検出
信号がそのパルス幅等によって他の検出信号と区別でき
るようになっている。[0013] The crank angle sensor 11 is used in the present embodiment.
In the cylinder engine 1, the sensor outputs a reference angle signal REF for each crank angle 180 ° corresponding to a stroke phase difference between cylinders and a unit angle signal POS for each unit crank angle. The reference angle signal REF is such that a detection signal corresponding to at least one specific cylinder can be distinguished from other detection signals by a pulse width or the like so that cylinder determination can be performed.
【００１４】ここで、前記筒内圧センサ10ａ〜10ｄ及び
クランク角センサ11の出力は、機関制御用として設けら
れたコントロールユニット12に出力される。マイクロコ
ンピュータを内蔵したコントロールユニット12は、図示
しない燃料噴射弁による燃料噴射量や点火時期を制御す
る一方、図３のフローチャートに示すようにして前記筒
内圧センサ10ａ〜10ｄの出力に基づき各気筒別に燃焼状
態（失火状態）の検出を行なう。The outputs of the in-cylinder pressure sensors 10a to 10d and the crank angle sensor 11 are output to a control unit 12 provided for controlling the engine. The control unit 12 having a built-in microcomputer controls the fuel injection amount and ignition timing by a fuel injection valve (not shown), and controls each cylinder based on the outputs of the in-cylinder pressure sensors 10a to 10d as shown in the flowchart of FIG. The combustion state (misfire state) is detected.
【００１５】尚、本実施例において、筒内圧積分手段，
重み付け設定手段，積分値重み付け手段，燃焼状態検出
手段としての機能は、前記図３のフローチャートに示す
ように、コントロールユニット12がソフトウェア的に備
えている。図３のフローチャートは、所定のクランク角
範囲（例えばＡＴＤＣ10°〜ＢＴＤＣ70°或いは100
°）として設定された筒内圧積分区間の始期をトリガー
として割込み実行されるものである。In this embodiment, in-cylinder pressure integrating means,
As shown in the flowchart of FIG. 3, the control unit 12 has functions as weight setting means, integral value weighting means, and combustion state detecting means as software. The flowchart of FIG. 3 shows a predetermined crank angle range (for example, ATDC 10 ° to BTDC 70 ° or 100 °).
The interrupt is executed with the beginning of the in-cylinder pressure integration section set as (°) as a trigger.
【００１６】かかる図３のフローチャートにおいて、ま
ず、ステップ１（図中ではＳ１としてある。以下同様）
では、前記所定のクランク角範囲を複数に区分した分割
積分区間Ａ〜Ｅ（図４参照）をクランク角センサ11から
の検出信号に基づいて検出し、かかる分割積分区間Ａ〜
Ｅ毎に前記筒内圧センサ10ａ〜10ｄで検出される筒内圧
を積分し、各分割積分区間Ａ〜Ｅ毎の筒内圧積分値ＩＭ
ＥＰA 〜ＩＭＥＰE を得る。In the flowchart of FIG. 3, first, step 1 (referred to as S1 in the figure; the same applies hereinafter).
Then, based on the detection signal from the crank angle sensor 11, divided integral sections A to E (see FIG. 4) obtained by dividing the predetermined crank angle range into a plurality are detected.
The in-cylinder pressure detected by the in-cylinder pressure sensors 10a to 10d is integrated for each E, and the in-cylinder pressure integrated value IM for each of the divided integration sections A to E is integrated.
EP A to IMEP E are obtained.
【００１７】本実施例では、前記所定のクランク角範囲
を等クランク角でＡ〜Ｅの５つに区分したが、クランク
角の設定範囲，分割数を限定するものでないことは明ら
かであり、また、各分割積分区間Ａ〜Ｅ毎に異なる角度
範囲としても良い。次のステップ２では、現在筒内圧の
積分を行なっているクランク角位置が、前記分割積分区
間Ａ〜Ｅのいずれに該当するかを判別し、予め各分割積
分区間Ａ〜Ｅ毎に設定されている重み付け定数ＫA 〜Ｋ
E の中から該当する重み付け定数を検索する。In the present embodiment, the predetermined crank angle range is divided into five equal angles A through E, but it is clear that the set range of the crank angle and the number of divisions are not limited. Alternatively, a different angle range may be set for each of the divided integration sections A to E. In the next step 2, it is determined whether the crank angle position where the in-cylinder pressure is currently integrated falls into any of the divided integration sections A to E, and is set in advance for each of the divided integration sections A to E. Weighting constants K A to K
Search the corresponding weighting constant from E.
【００１８】本実施例においては、重み付け定数ＫA 〜
ＫE をＫA ＝５％，ＫB ＝10％，Ｋ C ＝25％，ＫD ＝30
％，ＫE ＝30％として、分割積分区間Ａ〜Ｅの後半にな
るに従って重み付けを大きくしてある。これは、燃焼に
よる圧力発生の絶対値が小さくなる低回転低負荷域では
長期に渡って後燃えし、失火の有無による筒内圧の変化
が、最大燃焼圧を示すクランク角位置よりも後でより明
確になるためである。In this embodiment, the weighting constant KA~
KETo KA= 5%, KB= 10%, K C= 25%, KD= 30
%, KE= 30%, and is set in the latter half of the divided integration sections A to E.
Weighting is increased according to the This is for burning
In the low rotation and low load range where the absolute value of pressure
Changes in in-cylinder pressure depending on the presence or absence of misfiring after burning for a long time
Is much brighter than the crank angle position that shows the maximum combustion pressure.
This is to be sure.
【００１９】従って、本実施例によると、重み付けを行
なわない場合に比べて、所定のクランク角範囲内におけ
る筒内圧積分値（ＩＭＥＰA 〜ＩＭＥＰE の合計）が失
火の有無によってより明確な差異を示すようになり、低
回転低負荷域においても高い精度で失火発生を検出させ
ることが可能となる。尚、各分割積分区間Ａ〜Ｅ毎の重
み付け定数ＫA 〜ＫE を機関運転条件に応じて変化させ
るようにしても良い。Therefore, according to the present embodiment, the cylinder pressure integrated value (total of IMEP A to IMEP E ) within the predetermined crank angle range shows a clearer difference depending on the presence or absence of misfiring, as compared with the case without weighting. As a result, it is possible to detect misfire occurrence with high accuracy even in a low rotation speed and low load range. The weighting constants K A to K E for each of the divided integration sections A to E may be changed according to the engine operating conditions.
【００２０】ステップ２で、当該分割積分区間における
重み付け定数Ｋx （ｘ＝Ａ〜Ｅ）を設定すると、次のス
テップ３では、当該分割積分区間における積分値ＩＭＥ
Ｐx（ｘ＝Ａ〜Ｅ）に前記重み付け定数Ｋx を乗算し
て、積分結果を更新設定する。ステップ４では、分割積
分区間Ａ〜Ｅの全てについて、筒内圧の積分と、該積分
結果の重み付け定数Ｋx （ｘ＝Ａ〜Ｅ）による更新設定
とが全て終了したか否かを判別し、分割積分区間Ｅにお
ける積分，重み付け処理が終了するまでは、ステップ１
〜３の処理を繰り返す。In step 2, a weighting constant K x (x = A to E) in the divided integration section is set. In the next step 3, the integral value IME in the divided integration section is set.
P x (x = A to E) is multiplied by the weighting constant K x to update and set the integration result. In step 4, it is determined whether or not the integration of the in-cylinder pressure and the update setting with the weighting constant K x (x = A to E) of the integration result have been completed for all of the divided integration sections A to E, Until the integration and weighting processing in the divided integration section E is completed, step 1
Steps 3 to 3 are repeated.
【００２１】分割積分区間Ａ〜Ｅの全てで処理が終了す
ると、ステップ５へ進み、各分割積分区間Ａ〜Ｅ毎に積
分され、各分割積分区間Ａ〜Ｅ毎の重み付け定数ＫA 〜
ＫEで重み付けがなされた積分値ＩＭＥＰA 〜ＩＭＥＰ
E を合計することで、所定のクランク角範囲内における
筒内圧の積分値を求め、かかる合計値をＴＩＭＥＰにセ
ットする。When the processing has been completed for all of the divided integration sections A to E, the process proceeds to step 5, where the integration is performed for each of the divided integration sections A to E, and the weighting constants K A to D for each of the divided integration sections A to E are set.
Integrated value has been weighted by K E IMEP A ~IMEP
By summing E , an integral value of the in-cylinder pressure within a predetermined crank angle range is obtained, and the total value is set in TIMEP.
【００２２】次のステップ６では、前記筒内圧積分値Ｔ
ＩＭＥＰと、基準値とを比較することで、失火発生の有
無を気筒別に検出する。前記基準値は、機関運転条件に
基づいて設定される値、或いは、前記筒内圧積分値ＴＩ
ＭＥＰの加重平均値に基づいて設定される値などを用い
ることができ、筒内圧積分値ＴＩＭＥＰを用いて行なわ
れる燃焼状態（失火状態）の検出を限定するものではな
い。In the next step 6, the in-cylinder pressure integral value T
By comparing IMEP with the reference value, the presence or absence of misfire is detected for each cylinder. The reference value is a value set based on engine operating conditions, or the in-cylinder pressure integrated value TI
A value set based on the weighted average value of the MEP can be used, and the detection of the combustion state (misfire state) performed using the in-cylinder pressure integrated value TIMEP is not limited.
【００２３】前記筒内圧積分値ＴＩＭＥＰは、分割され
た区間毎に重み付けを行なうことで、燃焼状態によって
明確な差が生じるように算出されるから、ステップ６に
おける失火診断では、たとえ低回転低負荷域であって
も、高精度な失火診断が可能である。The in-cylinder pressure integrated value TIMEP is calculated so that a clear difference is produced depending on the combustion state by weighting each divided section. High accuracy misfire diagnosis is possible even in the range.
【００２４】[0024]
【発明の効果】以上説明したように本発明によると、筒
内圧の積分値に基づいて燃焼状態の検出を行なう装置に
おいて、分割した複数の積分区間毎に重み付けを行なう
と共に、燃焼の後半ほど重み付けを大きく設定すること
によって、たとえ低回転低負荷域であっても筒内圧積分
値が燃焼状態に応じて明確に異なる値を示すようにで
き、筒内圧積分値を用いた燃焼状態の検出精度を向上さ
せることができるという効果がある。As described above, according to the present invention, in an apparatus for detecting a combustion state based on an integral value of an in-cylinder pressure, weighting is performed for each of a plurality of divided integral sections.
At the same time, by setting a larger weight in the latter half of the combustion , even in the low rotation and low load range, the in-cylinder pressure integrated value can clearly show a different value depending on the combustion state. There is an effect that the detection accuracy of the combustion state can be improved.
【図１】本発明の基本構成を示すブロック図。FIG. 1 is a block diagram showing a basic configuration of the present invention.
【図２】本発明の一実施例を示すシステム概略図。FIG. 2 is a system schematic diagram showing one embodiment of the present invention.
【図３】実施例の失火検出の様子を示すフローチャー
ト。FIG. 3 is a flowchart illustrating a state of misfire detection according to the embodiment.
【図４】実施例における積分区間の分割の様子を示す線
図。FIG. 4 is a diagram showing a state of division of an integration section in the embodiment.
１ 内燃機関 10ａ〜10ｄ 筒内圧センサ 11 クランク角センサ 12 コントロールユニット 1 internal combustion engine 10a-10d cylinder pressure sensor 11 crank angle sensor 12 control unit
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平１−301946（ＪＰ，Ａ) 特開 平４−81557（ＪＰ，Ａ) 特開 平４−321751（ＪＰ，Ａ) 特開 平４−104033（ＪＰ，Ａ) 実開 昭64−15937（ＪＰ，Ｕ) 実開 昭63−17432（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.6，ＤＢ名) F02D 45/00 G01M 15/00 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-301946 (JP, A) JP-A-4-81557 (JP, A) JP-A-4-321175 (JP, A) JP-A-4-321 104033 (JP, A) Fully open sho 64-15937 (JP, U) Fully open sho 63-17432 (JP, U) (58) Fields investigated (Int. Cl. 6 , DB name) F02D 45/00 G01M 15 / 00
Claims (1)
段と、 所定のクランク角範囲を区分してなる複数の積分区間毎
に、前記筒内圧検出手段で検出される筒内圧を積分する
筒内圧積分手段と、 前記複数の積分区間毎に筒内圧積分値の重み付けを設定
する手段であって、燃焼の後半ほど重み付けを大きく設
定する重み付け設定手段と、 前記筒内圧積分手段で前記複数の積分区間毎に得られた
筒内圧積分値を、前記重み付け設定手段で設定された各
積分区間毎の重み付けによってそれぞれに重み付けを行
なって合計し、前記所定のクランク角範囲における筒内
圧の積分値を求める積分値重み付け手段と、 該積分値重み付け手段で得られた前記所定のクランク角
範囲における筒内圧の積分値に基づいて機関の燃焼状態
を検出する燃焼状態検出手段と、 を含んで構成されたことを特徴とする内燃機関の燃焼状
態検出装置。An in-cylinder pressure detecting means for detecting an in-cylinder pressure of an internal combustion engine, and an in-cylinder pressure detected by the in-cylinder pressure detecting means are integrated for each of a plurality of integration sections dividing a predetermined crank angle range. Cylinder pressure integrating means, and means for setting a weight of the cylinder pressure integrated value for each of the plurality of integration sections, wherein the weight is set to be larger in the latter half of combustion.
A weight setting means for constant, the cylinder internal pressure integral cylinder pressure integrated value obtained for each of the plurality of integral intervals in unit, by performing weighting to each by the weighting for each integration interval for each set by the weight setting means Integral value weighting means for summing and calculating an integrated value of the in-cylinder pressure in the predetermined crank angle range; and combustion of the engine based on the integrated value of the in-cylinder pressure in the predetermined crank angle range obtained by the integrated value weighting means. A combustion state detection device for an internal combustion engine, comprising: combustion state detection means for detecting a state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30819893A JP2917198B2 (en) | 1993-12-08 | 1993-12-08 | Device for detecting combustion state of internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30819893A JP2917198B2 (en) | 1993-12-08 | 1993-12-08 | Device for detecting combustion state of internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07158502A JPH07158502A (en) | 1995-06-20 |
| JP2917198B2 true JP2917198B2 (en) | 1999-07-12 |
Family
ID=17978101
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30819893A Expired - Lifetime JP2917198B2 (en) | 1993-12-08 | 1993-12-08 | Device for detecting combustion state of internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2917198B2 (en) |
-
1993
- 1993-12-08 JP JP30819893A patent/JP2917198B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07158502A (en) | 1995-06-20 |
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